Supporting Information Electrochemical Impedance Spectroscopy of Dye-Sensitized Solar Cells with Post-Treated TiO2 Photoelectrodes using Hafnium(IV) Chloride and Titanium(IV) Chloride Hyun Woo Seo, Subrata Sarker, Dong Min Kim* Department of Materials Science and Engineering, Hongik University, Sejong 339-701, South Korea
Keywords: dye-sensitized solar cells; post-treatment; hafnium tetrachloride; titanium tetrachloride; electrochemical impedance spectroscopy; energetic factors. *
To whom correspondence should be addressed.
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Figure S1. EIS spectra of the reference DSSC (R) measured at different potentials in 1 sun condition. The solid lines represent fitting of the experimental data to the equivalent circuit in Zview software.
Vcell (V)
ROS Rr (Ω cm2) (Ω cm2)
Cμ (F/cm2)
0.45
4.87
107.85
9.60×10
0.50
11.04
30.03
2.11×10
0.55
8.39
12.46
4.10×10
0.60
7.00
6.73
0.65
6.67
4.09
Rd Rt RCE (Ω cm2) (Ω cm2) (Ω cm2)
-5
-
2.98
0.78
-4
4.83
6.03
0.78
-4
3.54
1.86
0.78
6.57×10
-4
2.56
0.59
0.76
9.56×10
-4
2.36
0.03
0.81
Table S1. The parameters Ohmic resistance (ROS), recombination resistance (Rr), chemical capacitance (Cμ), ionic diffusion resistance (Rd), trasnport resistance (Rt), and charge transfer resistance (RCE) obtained from the fiting of the EIS spectra of the reference cell (R) at difference applied potential (Vcell).
Figure S2. EIS spectra of the DSSC with H measured at different potentials in 1 sun condition. The solid lines represent fitting of the experimental data to the equivalent circuit in Zview software.
Vcell (V)
ROS Rr (Ω cm2) (Ω cm2)
Cμ (F/cm2)
Rd Rt RCE (Ω cm2) (Ω cm2) (Ω cm2)
0.45
7.30
76.53
1.55×10
-4
-
9.79
0.64
0.50
8.62
27.75
3.31×10
-4
3.51
2.74
0.64
0.55
7.23
12.92
5.66×10
-4
2.66
0.78
0.72
0.60
6.72
7.37
8.75×10
-4
2.33
0.35
0.67
0.65
6.52
4.55
1.25×10
-3
2.19
0.23
0.64
Table S2. The parameters Ohmic resistance (ROS), recombination resistance (Rr), chemical capacitance (Cμ), ionic diffusion resistance (Rd), trasnport resistance (Rt), and charge transfer resistance (RCE) obtained from the fiting of the EIS spectra of the cell (H) at difference applied potential (Vcell).
Figure S3. EIS spectra of the DSSC with T measured at different potentials in 1 sun condition. The solid lines represent fitting of the experimental data to the equivalent circuit in Zview software.
Vcell (V)
ROS Rr (Ω cm2) (Ω cm2)
Cμ (F/cm2)
Rd Rt RCE (Ω cm2) (Ω cm2) (Ω cm2)
0.45
4.84
58.43
5.12×10
-4
-
1.96
0.65
0.50
6.95
22.41
8.52×10
-4
2.46
0.72
0.68
0.55
7.25
10.89
1.30×10
-3
2.87
0.44
0.66
0.60
7.42
6.20
1.89×10
-3
3.09
0.29
0.66
0.65
7.63
3.81
2.61×10
-3
3.34
0.21
0.65
Table S3. The parameters Ohmic resistance (ROS), recombination resistance (Rr), chemical capacitance (Cμ), ionic diffusion resistance (Rd), trasnport resistance (Rt), and charge transfer resistance (RCE) obtained from the fiting of the EIS spectra of the reference cell (T) at difference applied potential (Vcell).
Figure S1, Figure S2, and Figure S3 show EIS spectra of DSSCs with R, H, and T, respectively, measured at different potentials from open-circuit voltage (Voc) to 0 V. The spectra were fitted to general equivalent circuit model as shown in Figure 5 for EIS study of DSSCs following the procedure reported in literature published elsewhere [1,2]. Table S1, Table S2, and Table S3 summarize the parameters Ohmic resistance (ROS), recombination resistance (Rr), chemical capacitance (Cμ), ionic diffusion resistance (Rd), trasnport resistance (Rt), and charge transfer
resistance (RCE) obatained from fiting of the EIS spectra of the DSSCs with R, H, and T, respectively.
Figure S4. Energy dispersive x-ray spectroscopy (EDS) spectra of the surfaces of the PEs a) R, b) H, and c) T.
References
[1]
S. Sarker, H.W. Seo, D.M. Kim, Chemical Physics Letters 585 (2013) 193.
[2]
E.M. Barea, J. Ortiz, F.J. Paya, F. Fernandez-Lazaro, F. Fabregat-Santiago, A. SastreSantos, J. Bisquert, Energy & Environmental Science 3 (2010) 1985.
